TMC2100

The TMC2100 provides an integrated motor driver solution for 3D-Printing, Cameras, Scanners and other automated equipment applications. The device has an integrated microstepping indexer, the completely noiseless current control mode StealthChop™ and is intended to drive a bipolar stepper motor. The output driver block consists of low RDSon N-Channel power MOSFETs configured as full H-bridges to drive the motor windings. The TMC2100 is capable of driving up to 2.5A of current from each output (with proper heatsinking). TMC2100 is designed for a supply voltage of 5~46V. The device has a step and direction interface and can be configured with digital pins.

The best way to set the motor current is by measuring the voltage on the Vref pin (0…2.5V) and adjusting the voltage with the potentiometer. The maximum settable motor current is 1.77A RMS (0.11Ohm sense resistors), but the SilentStepSticks can only be used up to 1.2A RMS.

Irms = (Vref * 1.77A) / 2.5V = Vref * 0.71

Vref = (Irms * 2.5V) / 1.77A = Irms * 1.41 = Imax

Vref -> Voltage on Vref pin

Irms -> RMS (Root Mean Square) current per phase (Irms = Imax / 1.41)

Imax -> Maximum current per phase (Imax = Irms * 1.41)

Note

​ 1. Vref measures Gnd and the voltage at the middle of the potentiometer.
​ 2. Do not connect the motor when measuring the voltage, otherwise it is easy to burn the driver.
​ 3. Power should be connected when measuring voltage, do not just connect USB power supply.